| abstract |
Emissions of nitrogen oxides (NOX) to the atmosphere are reduced by treatment of gases containing nitrogen oxides with a reducing agent such as ammonia in the presence of a catalyst containing a mesoporous crystalline catalyst. The mesoporous crystalline catalyst comprises an inorganic, non-layered, porous, crystalline phase aluminosilicate material which exhibits a benzene adsorption capacity of greater than about 15 grams benzene per 100 grams at 50 torr and 25 DEG C. In its preferred catalytic form, the crystalline material has a uniform, hexagonal arrangement of pores with diameters of at least about 13 ANGSTROM and exhibiting, after calcination, an X-ray diffraction pattern with at least on d-spacing greater than about 18 ANGSTROM and a hexagonal electron diffraction pattern that can be indexed with a d100 value greater than about 18 ANGSTROM which corresponds to at least one peak in the X-ray diffraction pattern. |